A substrate production apparatus for producing a substrate for a display device is disclosed. The substrate production apparatus includes a first production apparatus including a first scriber to scribe a first mother substrate into at least one first model substrate and at least one second model substrate, a first grinder to grind the first model substrate, and a first cleaning unit to clean the ground first model substrate. The substrate production apparatus also includes a second production apparatus including a second scriber to scribe a second mother substrate into at least one first model substrate and at least one second model substrate, a second grinder to grind the second model substrate, and a second cleaning unit to clean the ground second model substrate. Additionally, the substrate production apparatus includes a common buffer unit to store the second model substrate from the first production apparatus and to store the first model substrate from the second production apparatus. The first model substrates have different dimensions from the second model substrates.